Which factor contributes to secondary radar's vulnerability to blind spots?

Prepare for the Air Traffic Control (ATC) Basics Test. Enhance your skills with diverse questions, informative hints, and detailed explanations to excel in your exam!

Secondary radar relies on transponders installed in aircraft to respond to interrogation signals from ground-based radar. When the transponder is located near obstructions, such as buildings or terrain, the transponder's signal can become obstructed or reflected, leading to areas where the radar cannot receive an accurate response. This can create "blind spots" in the radar coverage, where aircraft cannot be detected or tracked effectively. The location and orientation of the transponder are crucial because, if the signal path is blocked or distorted, the radar will not be able to receive the necessary information about the aircraft's location, altitude, or identity. Understanding this aspect is essential for managing radar coverage effectively and ensuring safety in air traffic operations.